SUMMARY

Writes a SAC file containing the correlation function.

SYNTAX

[W]RITE[COR] {file}

INPUT

file:	The name of the SAC file to write.

DEFAULT VALUES

WRITECOR COR

DESCRIPTION

The structure of the correlation function written out by this command is determined by the algorithm used to compute it. Since the data is partitioned into windows, and sample correlation functions are calculated from each window, then averaged, the length of the correlation function is determined by the data window size. It contains exactly one less sample than twice the number of samples in the data window. However, since FFT's are used to calculate the sample correlation functions, the number of points in the file is a power of two. It is, in fact, the first power of two larger than the data window size (in samples). The additional samples are zero. The correlation function is also circularly rotated within the file, due to the pecularities of computing correlations with the FFT algorithm. This means that the zero-lag sample is the first sample in the file, and the negative-lag samples follow the positive-lag samples.

ERROR MESSAGES

• 5003: No correlation function calculated.